An integrated model for predicting the flame propagation in crimped ribbon flame arresters  

作　　者：Zheng Wang Bing Sun Qingshan Huang Fuhua Jiang 

机构地区：[1]Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences [2]State Key Laboratory of Safety and Control for Chemicals, SINOPEC Research Institute of Safety Engineering [3]Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences

出　　处：《Chinese Journal of Chemical Engineering》2018年第5期930-941,共12页中国化学工程学报（英文版）

基　　金：Supported by the National Key Research and Development Program of China(2016YFB0301701);the National Natural Science Foundation of China(21706268;91434114;21376254);the Postdoctoral Science Foundation of Qingdao Municipal Government(Y7330419DM);the Instrument Developing Project of the Chinese Academy of Sciences(YZ201641);State Key Laboratory of Safety and Control for Chemicals of China

摘　　要：Crimped ribbon flame arresters are important safety devices in the chemical industry, especially for the danger- ous situations. Although proper design of arresters by the numerical simulation method is promising, its reliabil- ity and accuracy are dependent upon the mathematical model. In this work, an integrated mathematical model for the microchannel in the crimped ribbon flame attesters was set up; the fluid flow behavior and the sensitiv- ities of four chemical kinetics mechanisms of propane-air on the accuracy were analysed. It is shown that turbu- lence is predominant in the microchannel of the crimped ribbon flame arresters under the defiagration and detonation conditions, and a new quenching criterion for the numerical simulation is proposed. The kinetics mechanism of Mansouri et al. among the four ones is the most accurate due to the best agreement of the pre- dicted outlet temperature at the experimental flameproof velocity with the autoignition temperature of propane-air. The species mass fraction profiles and the temperature distribution, which are too difficult to mea- sure due to the tiny dimension of the microchannel in experiments, are captured. The fundamental insights into chemical reactions and heat loss are well portrayed. It can be concluded that the integrated mathematical model established in this work can be used as a reliable tool for modeling, selecting and designing such type of crimped ribbon flame attesters with the propane-air medium in the future.Crimped ribbon flame arresters are important safety devices in the chemical industry, especially for the dangerous situations. Although proper design of arresters by the numerical simulation method is promising, its reliability and accuracy are dependent upon the mathematical model. In this work, an integrated mathematical model for the microchannel in the crimped ribbon flame arresters was set up; the fluid flow behavior and the sensitivities of four chemical kinetics mechanisms of propane-air on the accuracy were analysed. It is shown that turbulence is predominant in the microchannel of the crimped ribbon flame arresters under the deflagration and detonation conditions, and a new quenching criterion for the numerical simulation is proposed. The kinetics mechanism of Mansouri et al. among the four ones is the most accurate due to the best agreement of the predicted outlet temperature at the experimental flameproof velocity with the autoignition temperature of propane-air. The species mass fraction profiles and the temperature distribution, which are too difficult to measure due to the tiny dimension of the microchannel in experiments, are captured. The fundamental insights into chemical reactions and heat loss are well portrayed. It can be concluded that the integrated mathematical model established in this work can be used as a reliable tool for modeling, selecting and designing such type of crimped ribbon flame arresters with the propane-air medium in the future.

关 键 词：MICROCHANNEL Flame arrester Chemical kinetics mechanism Mathematical model Deflagration and detonation flames 

分 类 号：TQ086.1[化学工程]